MOS 21B Combat Engineer Duty Descriptions

MOS 21B, Combat Engineer was converted to MOS 12B, Combat Engineer.

Combat Engineer

As a Combat Engineer in the Engineer Support Squad of the Group Service Support Company (GSSC), Group Support Battalion (GSB), 5th Special Forces Group (Airborne), my role involves enhancing the tactical training of an 8-man construction squad. I develop tactical standard operating procedures (SOP) that encompass mobility, counter mobility, and survivability. Additionally, I am accountable for the maintenance and training of a Small Excavating Equipment (SEE) Tractor and the implementation and accountability of an explosives demolition set valued at $120,000.


Team Leader

Team Leader in an Engineer Company (Sapper)

Within an Arctic Engineer Battalion, I am responsible for the well-being, morale, and discipline of a five-man team. Working alongside the Squad Leader, I assist in training the team in mobility, counter mobility, survivability, general demolitions, and general engineering skills, as well as warrior tasks and battle drills. Furthermore, I ensure the accountability and maintenance of one M1152A1 and M1097 HMMWV, as well as various Sets, Kits, and Outfits valued at over $400,000.

21B Combat Engineer Team Leader

As a Team Leader in an engineer sapper company within the 14th Engineer Battalion, supporting the 555th Engineer Brigade, my responsibilities revolve around providing assured mobility, countermobility, survivability, and general engineering support to the 1st Corps. I am entrusted with the accountability, training, morale, health, welfare, and combat readiness of four soldiers. Additionally, I supervise the maintenance and accountability of one M1090 FMTV, one MICLIC, one bolster trailer, and various sets, kits, and outfits valued in excess of $500,000.

Team Leader

In my role as a Team Leader, I oversee the operation of engineer wheeled/tracked vehicles. I am responsible for directing and assisting in launching and retrieval of the AVLB, boresighting, determining zero settings, firing CEV weapon systems, maintaining vehicle armament components, directing the construction of fighting positions and wire entanglements, controlling fire team movements, placing explosives, and clearing misfires. Additionally, I oversee mine-clearing operations, reconnaissance activities, and various other engineering tasks.

Team Leader

As a Team Leader in a Combat Engineer Company assigned to the 11th Armored Cavalry Regiment, my primary focus is to provide mobility, counter mobility, and engineer reconnaissance support during rotational training exercises at the National Training Center (NTC). I am responsible for the safety, training, morale, and welfare of three soldiers. I train my team to execute Full Spectrum Engineer Operations in support of the Global War on Terrorism. Furthermore, I ensure the operator-level maintenance of two M113A3 Armored Personnel Carriers, one M1097 HMMWV, and multiple sets, kits, and outfits.


Squad Leader

Squad Leader

In my role as a Squad Leader in a Mobility Augmentation Company (MAC) within a Combat Effects Engineer Battalion with worldwide deployment capability, I provide mobility, countermobility, and survivability support. I am responsible for the training, discipline, counseling, morale, health, and welfare of 11 soldiers and their families. I prepare the squad to execute collective tasks in both combat and peacetime operations, including force protection measures. Additionally, I supervise the maintenance and accountability of three AVLBs, one M113A3, and sets, kits, and outfits valued at over $2,000,000.

Squad Leader in an Engineer Company (Sapper)

As a Squad Leader in an Engineer Company (Sapper) within a Combat Effects Engineer Battalion, I am responsible for the well-being, morale, discipline, and training of a five-man team. I oversee the team’s training in mobility, counter mobility, survivability, demolitions, general engineering skills, and all warrior tasks and battle drills. Additionally, I am accountable for the maintenance and upkeep of one M113A3 and various Sets, Kits, and Outfits valued in excess of $400,000.

Reconnaissance NCO

21B Battalion Reconnaissance NCO

Served as the Battalion Reconnaissance Non-Commissioned Officer in a 563 Soldier Construction Effects Battalion attached to Area Support Group Kuwait in support of OPERATION NEW DAWN; responsible for overseeing the management of the Battalion’s Operational and Training Class V accounts; accountable for providing the Battalion Command with Fiscal Year Ammunition Forecasts and allocation updates; entrusted with the training and well-being of two Soldiers; held responsibility for the inventory and maintenance of Battalion Tactical operations equipment valued at over $200,000.

Reconnaissance NCO in an Engineer Bn HQ

Holds the position of Reconnaissance Non-Commissioned Officer within an engineer battalion headquarters capable of providing mission command over both general and combat engineering units with domestic and foreign contingency requirements; entrusted with the training, safety, health, welfare, and professional development of two Soldiers; supervises the maintenance of an M113A2 Armored Personnel Carrier, an M577 Tactical Command Post Track, an M1152 HMMWV, an M1165 HMMWV, and associated BII, sets, kits, outfits, and weapons systems valued at approximately $1,300,000; provides assistance in CMD Section planning and establishment of TAC CP.


Duty Title Not Provided

Supervises lower-ranking soldiers and offers technical guidance to the soldiers in the fulfillment of their duties; assists in the performance of organizational maintenance of vehicle and armament system components; directs the construction of fighting positions and wire entanglements; oversees a mine-clearing line charge loading team; directs minefield marking party and operation of mine scattering systems; carries out reconnaissance operations, determining limiting slopes, curves, stream velocity, and gap widths.

Battalion Mobility/Counter Mobility/Survivability Battle Staff NCO

Served as the Battalion Mobility/Counter Mobility/Survivability Battle Staff Non-Commissioned Officer in a Construction Effects Battalion forward deployed to the Kuwait Area of Responsibility in support of Operation New Dawn; responsible for the health, welfare, and morale of two soldiers within the Battalion S3 Training Section; tasked with resourcing, coordinating, and scheduling training and providing the battalion command with accurate schools tracking and updates for operational needs and career enhancement; holds responsibility for the maintenance and accountability of the battalion’s Tactical operations equipment valued at over $200,000.

Platoon Sergeant

Assigned as a Platoon Sergeant in a combat engineer platoon of the 95th Combat Engineer Company in the 84th Engineer Battalion in support of the 8th Theater Sustainment Command and USARPAC; responsible for the leader development, individual training, discipline, welfare, and morale of 31 Soldiers; assists the company leadership with the planning and preparation of company and platoon operations; supervises and ensures successful execution of platoon operations, including administrative actions and logistical support; accountable for the maintenance and accountability of equipment valued in excess of $6,300,000.

BDE ENG NCOIC

Serves as the Non-Commissioned Officer in Charge (NCOIC) of the Brigade Engineer Cell in a Light Infantry Brigade; advises and assists in missions in support of Operation Enduring Freedom 14; responsible for daily battle tracking and reporting of engineer equipment and operations throughout the entire BCT Area of Operations; in charge of forward operating base work order submissions and maintenance; provides assistance to the brigade engineer officer in charge in construction planning, scheduling, and material estimates; coordinates the preparation of operations orders, standing operating procedures, and contingency plans; coordinates the employment of engineer elements with adjacent units.

Company Operations Sergeant

Distinguished as the Company Operations Sergeant for an Air Assault Sapper Company; entrusted with the processing, tracking, and documentation of all administrative actions, as well as the maintenance of personnel and training records at the Company level; coordinates and requests all land, ammunition, training aids, and resources; liaises with adjacent and higher staffs for operational and tactical support; holds responsibility for the accountability, safety, discipline, welfare, training, and development of seven Soldiers; oversees three tactical vehicles, sets, kits, outfits, and all assigned MTOE equipment valued in excess of $225,000.

Engineers handle the technical aspects of the army, encompassing the maintenance of mechanical, electrical, and electronic systems, along with their associated hardware. Their activities span from constructing bridges and clearing minefields to repairing tanks. Their skillset includes bridge-building, general construction, explosive demolitions, providing clean water, utilizing hand and power tools, operating boats, conducting basic bomb disposal, constructing field defenses, and safeguarding our freedom to maneuver while impeding the enemy. Combat engineers play a vital role in clearing routes, repairing airfields and harbors, and bridging rivers swiftly and often under enemy fire, all while ensuring the protection of our own troops through the deployment of quick and effective obstacles. Additionally, our electrical and mechanical engineers possess the expertise to repair any equipment utilized on the battlefield, ranging from rifles and radios to motorbikes and missiles.


21B Combat Engineer Duty Descriptions:

Skill Level 1 MOSC 21B1O: Performs fundamental combat construction tasks. Operates a range of engineer vehicles, both light and heavy. Participates in combat mobility, countermobility, and survivability operations, either operating or serving as a crewmember on a CEV (Combat Engineer Vehicle), AVLB (Armored Vehicle Launched Bridge), or an ACE (Armored Combat Earthmover). Responsible for preparing and installing priming and firing systems for demolition and explosives. Handles the arming, disarming, and installation of anti-personnel and anti-tank mines. Proficient in locating mines visually or by employing a mine detector. Skilled in identifying and neutralizing booby traps, friendly and enemy mines, and firing devices.

Skill Level 2 MOSC 21B2O: Performs duties at the previous skill level and assumes supervisory responsibilities over soldiers of lower ranks, providing them with technical guidance for their tasks. Directs and assists in the operation of engineer wheeled or tracked vehicles. Oversees and/or operates the ACE (Armored Combat Earthmover). Directs and assists in the launching and retrieval of an AVLB. Proficient in boresighting, determining zero settings, and operating the CEV weapon systems. Assists in organizational maintenance of vehicle and armament system components. Directs the construction of fighting positions and wire entanglements. Controls the movements of fire teams. Skilled in placing explosives and resolving misfires. Directs a team responsible for loading a mine-clearing line charge. Oversees the marking of minefields and the dispensing operation of mine scattering systems. Conducts reconnaissance operations and determines limiting slopes, curves, stream velocity, and gap widths.

Skill Level 3 MOSC 21B3O: Performs duties at the preceding skill level and takes charge of soldiers of lower ranks, providing them with technical guidance for their tasks. Assigns, supervises, and instructs squad and section personnel. Directs the utilization and maintenance of vehicles and equipment. Supervises and directs the operation of a CEV and its crew. Prepares the CEV for firing. Oversees the preparation of range cards for the CEV. Ensures unit and job site security. Issues oral squad operation orders. Leads squad maneuvers during patrols. Directs the installation, removal, and reporting of minefields. Conducts breaching operations. Collects data and calculates the requirements for explosives and related materials. Directs the construction of combat bunkers, shelters, non-explosive anti-vehicular obstacles, and improvised lifting devices. Performs ground reconnaissance for roads, routes, bridges, tunnels, fords, and ferries. Prepares demolition and engineer reconnaissance reports. Directs the assembly of various military bridges.

Skill Level 4 MOSC 21B4O: Performs duties at the preceding skill level and assumes responsibility for soldiers of lower ranks, providing them with technical guidance for their tasks. Assigns tasks to subordinate elements and personnel. Ensures accountability of soldiers, materials, and equipment. Supervises mine warfare, demolitions, and combat construction operations. Enforces safety standards, field sanitation, communication procedures, security measures, and job specifications. Provides support for construction and tactical movements. Directs the assignment of CEV and AVLB in support of maneuver forces. Operates a CEV crew qualification range.

Share this article
Shareable URL
Prev Post

MOS 21A Engineer Officer Duty Descriptions

Next Post

MOS 21C Bridge Crewmember Duty Descriptions

Read next